血清学阴性类风湿关节炎关节液中抗环瓜氨酸肽抗体、抗突变型瓜氨酸波形蛋白抗体的测定及临床意义

Significance and diagnostic value of synovial fluid anti-cyclic citrullinated peptide antibody and anti-mutated citrullinated vimentin antibodies in patients with serum negative rheumatoid arthritis

目的:检测血清学阴性类风湿关节炎(serum negative rheumatoid arthritis,SNRA)患者的关节液中抗环瓜氨酸肽(cyclic citrullinated peptide,CCP)抗体、抗突变型瓜氨酸波形蛋白(mutated citrullinated vimentin,MCV)抗体水平,了解关节液中这两种抗体对诊断SNRA的临床意义。方法:应用酶联免疫吸附测定(enzyme linked immunosorbent assay,ELISA)法检测两组患者膝关节液中抗CCP抗体和抗MCV抗体,实验组为SNRA患者,共29例,对照组为骨关节炎(osteoarthritis,OA)患者,共28例,并收集两组患者的临床表现及实验室指标。结果:实验组29例SNRA患者膝关节液中抗CCP抗体阳性者10例(34.5%),测定值为(114.5±62.6)U/m L;抗MCV抗体阳性者6例(20.7%),测定值为(32.0±11.3)U/m L;对照组28例OA患者膝关节液中3例抗CCP抗体阳性(10.7%),测定值为(20.6±0.1)U/m L,2例抗MCV抗体阳性(7.1%),测定值为(22.1±1.7)U/m L。SNRA组关节液抗CCP抗体的阳性率显著高于对照组(34.5%vs.10.7%,χ2=4.571,P<0.05);SNRA组关节液抗MCV抗体的阳性率高于对照组(20.7%vs.7.1%,χ2=2.167,P>0.05),但差异无统计学意义;抗CCP抗体在SNRA中的敏感性为34.5%,特异性为89.3%,阳性预测值为76.9%,阴性预测值为56.8%;抗MCV抗体敏感性为20.7%,特异性为92.9%,阳性预测值为75.0%,阴性预测值为53.1%;膝关节液中抗CCP抗体和抗MCV抗体两者联合检测的敏感性为48.0%,特异性为82.8%,SNRA关节液抗CCP抗体阳性组、抗MCV抗体阳性组与各自阴性组相比较,在年龄、病程和晨僵方面差异均无统计学意义,而膝关节液抗CCP抗体阳性组和抗MCV抗体阳性组红细胞沉降率(erythrocyte sedimentation rate,ESR)、C反应蛋白(C-reactive protein,CRP)和28个关节的疾病活动评分(the disease activity score in 28 joints,DAS28)均比各自阴性组高(P均<0.01)。抗CCP抗体与ESR和CRP之间呈正相关(r=0.567,P<0.01;r=0.664,P<0.01);抗MCV抗体与ESR和CRP之间呈正相关(r=0.344,P<0.01;r=0.749,P<0.01)。结论:SNRA关节液抗CCP抗体和抗MCV抗体联合检测有助于SNRA诊断和疾病活动的判断。

Objective： To explore the significance of synovial fluid（SF）anti-cyclic citrullinated peptide （CCP） antibodies and anti-mutated citrullinated vimentin （MCV） antibodies in the diagnosis of serum negative rheumatoid arthritis （SNRA）. Methods： Enzyme linked immunosorbent assay （ELISA） method was apllied in the detection of two groups of patients with knee joint fluid resistance against CCP antibody and antibody of MCV, the experimental group to SNRA patients, a total of 29 cases, and the control for patients with osteoarthritis （OA）, a total of 28 cases, and clinical manifestations and laboratory parameters of the two groups were collected. Results： The positive rate of synovial fluid anti-CCP was 34.5% in the SNRA patients, which was significantly higher than 10.7% in the control patients（χ^2 =4. 571, P 〈 0.05）. The positive rate of synovial fluid anti-MCV was 20.7% in the SNRA patients, which was significantly higher than 7.1% in the control patients（χ2 =2. 167, P 〉0.05）. The SNRA patients of SF anti- CCP and anti-MCV positive had no significant difference from the SNRA patients of SF anti-CCP and anti- MCV negative in age, course and morning stiffness. The levels of erythrocyte sedimentation rate （ESR） , C-reactive protein（CRP） and DAS28 scores in the SF anti-CCP positive patients were higher than those of the SF anti-CCP negative patients. The levels of ESR, CRP and DAS28 scores in the SF anti-MCV positive patients were higher than those of the SF anti-MCV negative patients, （ all P 〈 0.01 ）. SF anti- CCP had correlation with ESR, CRP（r = 0. 567, P 〈 O. 01 ; r = 0. 664, P 〈 0.01 ）. SF anti-MCV had correlation with ESR, CRP（r =0. 344, P 〈0.01 ; r =0.749, P 〈0.01 ）. Conclusion： SF anti-CCP and anti-MCV are helpful for the diagnosis of SNRA and judgement of SNRA activity.